The PKOM 4A is an energy efficient compact service unit providing whole house ventilation with heat recovery, space heating and cooling, together with enough domestic hot water for a family of four.

This compact service unit provides heat recovery ventilation, with an integral heat pump for warm air to be introduced to your habitable rooms, via the ventilation ductwork. The heat pump can be reversed to provide cooling as well, great for those warmer summer nights when you could sleep better with a 4-5°C temperature reduction. There is a second heat pump within the PKOM 4A unit to provide domestic hot water in a 220L tank underneath, making it the only compact service unit of its kind. This heating and ventilating system can be up to 680% efficient in comparison to a gas boiler at only 90% efficiency.

This is all in a footprint of less than 0.75m² – convenient if you have limited space in your home or your heat demand is low enough to not warrant a formal heating system. The PKOM 4A
uses R-1234yf refrigerant, which is significantly more environmentally friendly, with a global warming potential (GWP) of less than 1. Its atmospheric lifetime is approximately 11 days, compared to 14 years for conventional refrigerants.

Following a comprehensive testing and validation process, the PKOM 4A has been listed in the SAP Appendix Q database. This marks an important milestone in recognising it as an energy-efficient alternative to traditional boilers, air source heat pumps, and conventional heat recovery ventilation systems.

The PKOM 4A is ideally suited to homes that are to be built to Passivhaus standard, or a very well insulated and airtight home with low U-values

In Britain, homes of between 80m² and 130m² (at a 2.4m ceiling height) would be suitable for the PKOM 4A, so apartments and townhouses are ideal candidates. Total Home Environment can complete a room-by-room heat loss calculation to establish if this system will be suitable for you and your home.